초록 ▼

A fluid delivery monitoring and control apparatus for use in a medication infusion system is designed for use with a disposable fluid pathway that incorporates a sterile cassette containing pumping elements and sensor interfaces. The apparatus comprises a multi-segment drive mechanism, controller, a

A fluid delivery monitoring and control apparatus for use in a medication infusion system is designed for use with a disposable fluid pathway that incorporates a sterile cassette containing pumping elements and sensor interfaces. The apparatus comprises a multi-segment drive mechanism, controller, and monitoring system. Fluid pumping is accomplished by controlling DC motors in the drive mechanism, each of which is coupled to two valves and a reciprocating piston for an individual pumping channel in the cassette. The motor is geared down to provide an appropriate maximum speed and torque. A cam sequentially actuates an inlet valve, piston, and an outlet valve in the cassette. A range of fluid delivery rates is achieved by periodically sending pulses to the motor. The output flow rate of the pump is maintained by a digital feedback controller which uses closed-loop feedback control to provide accurate regulation. At regular time intervals, the controller computes the motor voltage pulse width based upon feedback information from an encoder.

대표청구항

CM,12. The apparatus of claim 1 wherein said encoding means comprise a disk mounted to rotate with said drive means, said disk having a plurality of indicia located at selected points about its periphery for indicating rate of movement of the drive means.

CM,12. The apparatus of claim 1 wherein said encoding means comprise a disk mounted to rotate with said drive means, said disk having a plurality of indicia located at selected points about its periphery for indicating rate of movement of the drive means.